Hi,
there was a maintenance this morning and since then, my Arena is different. I can get attacked and attack players from what I assume are other servers. The highest player on my server is lvl 41 and now I have to fight lvl 50 players, who have obviously been playing the game for much longer, have had more time to farm better gear, more affinity solvent, etc...
I hope this is a bug and not an intentional change since it will be impossible to beat most of these players and would be really unfair.
I'm on Lumina III, you see on the screenshots our leader board with everyone lvl 41 and then the people I can attack lvl 50.